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the last word

Photography meets digital computer technology. Photography wins -- most of the time.

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Testing for ETTR, part 10

December 9, 2012 JimK Leave a Comment

The Leica M9, like the Sony NEX-7 and unlike the Nikon D4 and D800, does not allow you to set color balance from a stored image. You press Set, then click on Manual, then take a picture of a magenta screen and you’ve set the color balance. Then you take a picture of anything, shut… [Read More]

The Last Word

Testing for ETTR, part 9

December 9, 2012 JimK Leave a Comment

Today I set the white balance on the Sony NEX-7 to approximate the true raw histogram by photographing a magenta test image on the computer screen. The NEX-7 does not allow you to set color balance from a stored image; you must go to the Brightness/Color menu, pick White Balance, and then pick Custom Setup…. [Read More]

The Last Word

Spotmetering for ETTR — testing

December 8, 2012 JimK 2 Comments

In the preceding post and an earlier one, a reader proposed an ETTR technique that I will summarize in Zone System terminology: Place the brightest significant highlight on Zone VIII. A simple way to achieve this is to set the metering mode on a (Nikon — see the comment for Canon technique) DSLR to spot,… [Read More]

The Last Word

ETTR by spot metering, part 2

December 8, 2012 JimK Leave a Comment

Shortly after I made this post, the reader who made the initial suggestion sent me an email with some comments and clarifications. I’ve quoted it below in two sections. Spot meter is in camera….1.5 percent in 5d3.  Easy to see coverage if you know where it is. So it is pretty easy to do this… [Read More]

The Last Word

Testing for ETTR, part 8

December 7, 2012 JimK Leave a Comment

In a comment to this post, a reader asked me to compare the ad hoc color balance adjustment technique that I developed a few days ago with the UniWB technique. I’d not been aware of that approach. It turns out the goal is the same: to get the in-camera histogram to approximate the true raw… [Read More]

The Last Word

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Articles

  • About
    • Patents and papers about color
    • Who am I?
  • How to…
    • Backing up photographic images
    • How to change email providers
    • How to shoot slanted edge images for me
  • Lens screening testing
    • Equipment and Software
    • Examples
      • Bad and OK 200-600 at 600
      • Excellent 180-400 zoom
      • Fair 14-30mm zoom
      • Good 100-200 mm MF zoom
      • Good 100-400 zoom
      • Good 100mm lens on P1 P45+
      • Good 120mm MF lens
      • Good 18mm FF lens
      • Good 24-105 mm FF lens
      • Good 24-70 FF zoom
      • Good 35 mm FF lens
      • Good 35-70 MF lens
      • Good 60 mm lens on IQ3-100
      • Good 63 mm MF lens
      • Good 65 mm FF lens
      • Good 85 mm FF lens
      • Good and bad 25mm FF lenses
      • Good zoom at 24 mm
      • Marginal 18mm lens
      • Marginal 35mm FF lens
      • Mildly problematic 55 mm FF lens
      • OK 16-35mm zoom
      • OK 60mm lens on P1 P45+
      • OK Sony 600mm f/4
      • Pretty good 16-35 FF zoom
      • Pretty good 90mm FF lens
      • Problematic 400 mm FF lens
      • Tilted 20 mm f/1.8 FF lens
      • Tilted 30 mm MF lens
      • Tilted 50 mm FF lens
      • Two 15mm FF lenses
    • Found a problem – now what?
    • Goals for this test
    • Minimum target distances
      • MFT
      • APS-C
      • Full frame
      • Small medium format
    • Printable Siemens Star targets
    • Target size on sensor
      • MFT
      • APS-C
      • Full frame
      • Small medium format
    • Test instructions — postproduction
    • Test instructions — reading the images
    • Test instructions – capture
    • Theory of the test
    • What’s wrong with conventional lens screening?
  • Previsualization heresy
  • Privacy Policy
  • Recommended photographic web sites
  • Using in-camera histograms for ETTR
    • Acknowledgments
    • Why ETTR?
    • Normal in-camera histograms
    • Image processing for in-camera histograms
    • Making the in-camera histogram closely represent the raw histogram
    • Shortcuts to UniWB
    • Preparing for monitor-based UniWB
    • A one-step UniWB procedure
    • The math behind the one-step method
    • Iteration using Newton’s Method

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